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Polylactic acid non-weaving cloth with high strength and low thermal contraction and manufacture method thereof

A technology of non-woven fabrics, manufacturing methods, applied in the direction of non-woven fabrics, textiles and papermaking, single-component polyester rayon, etc., to achieve the effect of wide application and low heat shrinkage

Inactive Publication Date: 2009-09-09
温州昌隆纺织科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a high-strength, low-heat-shrinkage, fully biodegradable polylactic acid nonwoven fabric and its manufacturing method, so as to overcome the defects of the existing polylactic acid nonwoven fabric and its manufacturing method

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • Polylactic acid non-weaving cloth with high strength and low thermal contraction and manufacture method thereof
  • Polylactic acid non-weaving cloth with high strength and low thermal contraction and manufacture method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Use polylactic acid slices with L polylactic acid content ≥ 95%, L lactic acid monomer content ≤ 5%, melting point 160°C, and melt index 50g / 10min as raw materials; pre-crystallize polylactic acid slices at 100°C for 20 minutes; The lactic acid slices are fully dried, the drying temperature is 95°C, and the drying time is 6 hours. The water content of the polylactic acid slices after drying is ≤45ppm; the dried polylactic acid slices are melted and extruded in a screw extruder, and the melt temperature is 178 ℃; the melt is transported to the spinneret through the metering pump and extruded to form filaments, the metering pump is 25r / min; the filaments are cooled evenly by double-side air cooling, and the cooling temperature is 15°C; the filaments are passed through the drafter at high speed The filaments are drawn by the airflow and evenly spread on the moving mesh curtain to form a fiber net. into 100g / m 2 Fibrous web; the obtained fibrous web is sent into a two-roll...

Embodiment 2

[0022] Use polylactic acid slices with L polylactic acid content ≥ 95%, L lactic acid monomer content ≤ 5%, melting point 160°C, and melt index 30g / 10min as raw materials; pre-crystallize polylactic acid slices at 100°C for 20 minutes; The lactic acid slices are fully dried, the drying temperature is 95°C, and the drying time is 6 hours. The water content of the polylactic acid slices after drying is ≤45ppm; the dried polylactic acid slices are melted and extruded in a screw extruder, and the melt temperature is 178 ℃; the melt is transported to the spinneret through the metering pump and extruded to form filaments, the metering pump is 25r / min; the filaments are cooled evenly by double-side air cooling, and the cooling temperature is 18°C; the filaments are passed through the drafter at high speed The filaments are drawn by the air flow and evenly spread on the moving mesh curtain to form a fiber net. The wire speed is 4200-4500m / min, the pressure of the compressed air is 0.4M...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Abstract

A polylactic acid non-weaving cloth with high strength and low thermal contraction is manufactured by adopting a method taking polylactic acid slices as raw materials, wherein the polylactic acid has the L polylactic acid not less than 95 percent, the L lactic acid monomer not more than 5 percent, the melting point not lower than 160 DEG C and the melt index being 20-60g / 10min; the quality of the manufactured non-weaving cloth at a unit area is 15-120g / m<2>, the breaking strength value in one direction (longitudinal direction) is not smaller than 1.5 times of the quality of the non-weaving cloth at the unit area, the breaking strength value in the other vertical direction (horizontal direction) is not smaller than 1.1 times of the quality of the non-weaving cloth at the unit area, the strength ratio in the longitudinal direction and the horizontal direction is smaller than 2, and the dry thermal contraction coefficient is 120 DEG C and is not larger than 5 percent in the 10min state. A high-speed airflow spray head is adopted to stretch to improve the degree of orientation of a continuous yarn so as to obtain enough fibre strength; and rolling mill line pressure higher than 100N / mm and roller temperature of 125-157 DEG C are adopted so as to obtain the optimal bond strength.

Description

technical field [0001] The invention relates to a spun-bonded nonwoven fabric product and a production method thereof (or a production process), in particular to a high-strength low-heat-shrinkage polylactic acid nonwoven fabric and a production method thereof. Background technique [0002] Spunbonded nonwovens and products compounded with other materials have been widely used in medical and sanitary products, packaging materials, filter materials, agriculture, industry and other fields. It is an inevitable trend to obtain materials that meet market performance and can be recycled and do not pollute the environment. The renewability and biodegradability of polylactic acid materials have been recognized, plastic products and fiber products made of polylactic acid have entered the market, and nonwoven products made of short polylactic acid fibers on non-woven materials have also begun Entering the market, but the most widely used spunbonded nonwovens have no products that mee...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H3/14D01D5/088D01F6/62
Inventor 陈连忠陈立东徐克勤濮颖军
Owner 温州昌隆纺织科技有限公司
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